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Master's Dissertation
DOI
10.11606/D.43.2017.tde-17052017-063702
Document
Author
Full name
Fábio Chibana de Castro
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2017
Supervisor
Committee
Abdalla, Elcio (President)
Fabris, Julio Cesar
Saa, Alberto Vazquez
Title in English
Tachyon Scalar Field Cosmology
Keywords in English
Cosmology
Dark Energy
Dark Matter
Tachyon
Abstract in English
In this work we test a cosmological model with an interaction between dark energy and dark matter, where a tachyon scalar field plays the role of dark energy. With that in mind, we developed a numerical code that solves the background equations and extracts the cosmological parameters and we compared the results of the interacting tachyon model with those of other dark energy candidates. Our results show that the model indeed explains the observational data and has interesting cosmological properties, but might face challenges when compared to other dark energy candidates.
Title in Portuguese
Cosmologia de Campos Escalares Taquionicos
Keywords in Portuguese
Cosmologia
Energia Escura
Matéria Escura
Táquion.
Abstract in Portuguese
Neste trabalho testamos um modelo cosmológico com uma interação entre energia escura e matéria escura, onde um campo escalar taquiônico desempenha o papel da energia escura. Para isso, desenvolvemos um código computacional que resolve as equações numericamente e vincula os parâmetros cosmológicos e, assim, comparamos os resultados do modelo taquiônico interagente com os de outros candidatos à energia escura. Nossas análises mostram que o modelo, de fato, consegue explicar os dados observacionais, além de possuir propriedades cosmológicas interessantes, mas apresenta dificuldades quando comparado a outros modelos de energia escura.
 
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Publishing Date
2017-05-26
 
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